the ironic thing about these midterms is that they are great for purging moderate republicans either in the primaries or general. democrats loading their bases by knocking out moderate republicans in republican-leaning seats just makes it easier to refill those seats with farther-right republicans the next cycle
for perspective, if clinton had won and republicans had an identical generic ballot performance to 2014, the result would be 65 republican senators after this year's elections if the same margins as 2016 held. the dems are already way too heavily loaded in red states in the senate and doing in the house is going to be a nightmare for them in following cycles. 2024 will probably be a slaughter for them assuming a democrat wins in 2020
if that margin continued to hold, it would be 69 republican senators in 2020 and 72 in 2022. turns out having all your political power based in a few centralized areas is a bad idea for controlling an equal-representation body